Method and apparatus for digitized waveform display

Abstract

An apparatus for displaying a digitized waveform includes an overview display configured to display a digitized waveform scrolling across the overview display, a zoom display configured to display a portion of the digitized waveform, and a control unit configured to cause the portion of the digitized waveform displayed in the zoom display to track the displayed portion of the digitized waveform in response to a track signal.

1. An oscilloscope for displaying a digitized waveform, comprising:
 a display screen for displaying an overview display of a digitized waveform horizontally scrolling across the overview display in accordance with a roll mode of operation; 
 said display screen concurrently displaying a zoom display of a portion of the digitized waveform; and 
 a control unit configured to cause the portion of the digitized waveform displayed in the zoom display to track the displayed portion of the digitized waveform in response to a track signal, such that the waveform portion displayed in said zoom display appears stationary; 
 wherein the control unit further comprises a user interface configured to generate the track signal in response to a user input. 
 
   
   
     2. The oscilloscope of  claim 1 , wherein the overview display further comprises a zoom indicator configured to indicate the portion of the digitized waveform displayed in the zoom display. 
   
   
     3. The oscilloscope of  claim 1 , wherein the control unit further comprises an adjustment control configured to change the portion of the digitized waveform displayed in the zoom display. 
   
   
     4. The oscilloscope of  claim 1 , further comprising an event detector configured to detect a defined event on the digitized waveform. 
   
   
     5. The oscilloscope of  claim 4 , wherein the control unit is further configured to generate the track signal in response to a detected defined event. 
   
   
     6. The oscilloscope of  claim 4 , wherein:
 the event detector is further configured to record times of defined events; 
 the control unit further comprises a recorded event interface configured to select a recorded defined event; and 
 the zoom display is configured to display a portion of the digitized waveform associated with a selected recorded defined event. 
 
   
   
     7. An oscilloscope for displaying a digitized waveform, comprising:
 means for displaying the digitized waveform in a horizontal scrolling operation over time; 
 means for concurrently displaying a magnified portion of the digitized waveform; 
 means for selecting a time span of the magnified portion of the waveform; and 
 means for modifying a length of the magnified portion of the waveform in accordance with said selected time span; 
 wherein the means for displaying the magnified portion of the digitized waveform is configured to display the portion of the digitized waveform over the selected time span when the means for displaying the digitized waveform is displaying the digitized waveform scrolling horizontally over time, such that the waveform portion displayed in said zoom display appears stationary; 
 wherein the control unit further comprises a user interface configured to generate the track signal in response to a user input. 
 
   
   
     8. The oscilloscope of  claim 7 , wherein the means for selecting the time span of the digitized waveform further comprises a user input interface. 
   
   
     9. The oscilloscope of  claim 7 , further comprising means for identifying an event on the digitized waveform, wherein the means for selecting a time span of the digitized waveform is configured to select a time span in response to an identified event. 
   
   
     10. The oscilloscope of  claim 7 , further comprising means for continuously acquiring the digitized waveform. 
   
   
     11. The oscilloscope of  claim 7 , further comprising means for providing a stored digitized waveform as the digitized waveform scrolling horizontally over time.